広角レンズ系 - Pentax Ricoh Imaging Co., Ltd.

Title:

広角レンズ系

Document Type and Number:

Japanese Patent JP5287022

Kind Code:

B2

Abstract:

A wide-angle lens system includes a negative first lens group, a negative second lens group and a positive third lens group, in this order from the object. The first lens group includes a negative meniscus lens element having the convex surface facing toward the object, and a positive lens element having a convex surface facing toward the object, in this order from the object. The first lens group includes at least one aspherical surface. The second lens group includes a negative meniscus lens element having the convex surface facing toward the object, and cemented lens elements having a positive lens element and a negative lens element, in this order from the object. The third lens group includes cemented lens elements having a negative lens element and a positive lens element, and a positive lens element having a convex surface facing toward the image, in this order from the object.

Inventors:

Yasuo Kanesashi

Application Number:

JP2008207276A

Publication Date:

September 11, 2013

Filing Date:

August 11, 2008

Export Citation:

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